JP2003244011A - Portable radio - Google Patents

Abstract

(57) [Summary] A portable radio device body is usually covered with a plastic case having low heat conductivity, and has a structure in which a chassis having high heat conductivity is not exposed to the outer surface. The market demand for the portable wireless device itself has required a further reduction in size and weight and a longer communication time including data transmission / reception, and both have to be satisfied. In order to solve the above-mentioned problems, the present invention provides a gap between a portable wireless device main body and a battery pack, forms a fin shape on the entire back surface of a chassis to which a heating element is attached, and provides an air hole in an upper case. Thus, the amount of heat on the rear surface of the chassis is radiated to the outer surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless device having an improved heat dissipation structure.

[0002]

2. Description of the Related Art A heat dissipation structure of a conventional portable wireless device will be described with reference to FIG. 4A is a front view of a conventional portable wireless device, FIG. 4B is a vertical sectional view, FIG. 4C is a bottom view, and FIG. 4D is a lateral sectional view. 1 is a chassis of a portable wireless device, 2 is a front cover, 3 is a top cover, 4 is a battery pack, and 5 is a power amplifier (hereinafter abbreviated as PA) that is the most heat generating component inside the portable wireless device. Module, 6 is a printed circuit board on which circuit electric parts are mounted, 7
Is a screw that fixes the printed circuit board 6 to the chassis 1,
1 is a lock knob for fixing the battery pack 4, 12 is a spring for facilitating attachment and detachment of the battery pack 4 by the lock knob 11, 1a, 4a, 4b, 11a are battery packs 4
Fixing claws 1b are bosses that fix the printed circuit board 6 to the chassis 1. In the conventional portable radio main body structure, the printed circuit board 6, the PA module 5, the screw 7 and the boss 1b are provided.
The chassis 1 fixed by the above, the front cover 2, the top cover 3, the main body unit including the lock knob 11 for fixing the battery pack 4 and the spring 12, and the battery pack 4 mounted on the back surface thereof.

[0003]

Since the body of the portable wireless device is usually covered with a plastic case having a low heat conductivity, and the chassis having a high heat conductivity is not exposed to the outside,
The heat dissipation efficiency was significantly reduced. In addition, although the amount of heat generated has increased several times with the digitalization of mobile wireless devices in recent years compared to the analog type, the allowable temperature of the electric components used is the same as before, so improvement of heat dissipation efficiency is required. Came. On the other hand, since the body of the portable wireless device has been required to be smaller and lighter at the same time, conventionally, for the purpose of protecting the electric parts of the body, for example, a continuous call for 3 minutes or a printed circuit board surface temperature is used.
The limit was set by the continuous call time and the temperature sensor so that the call could be disconnected at 70 ° C, but due to market demands, further downsizing, weight reduction and longer call duration including data transmission / reception have been demanded. Need to be satisfied.

[0004]

In order to solve the above-mentioned problems, the first embodiment of the present invention provides a gap between the main body of the portable wireless device and the battery pack and forms a fin shape on the entire back surface of the chassis to which the heating element is attached. By forming the air holes in the upper case, the heat quantity of the back surface of the chassis is radiated to the outer surface. In order to solve the above-described problems, the second and third embodiments of the present invention provide a mechanism for inserting or mounting a heat radiating adapter detachable by the user between the portable wireless device main body and the battery pack, and The heat quantity is radiated to the outside, and the user can attach an optional heat radiation adapter as needed, especially when the ambient temperature is high.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat dissipation structure which is a first embodiment of the present invention will be described with reference to FIG. FIG. 1A is a front view of the portable wireless device. FIG. 3B is a vertical sectional view.
FIG. 3C is a rear perspective view with the battery pack 4 removed. FIG. 3D is a bottom view. FIG. 6E is a cross-sectional view. The structure of the portable wireless device includes a chassis 1 in which a substrate 6 and a PA module 5 are fixed by screws 7, a front cover 2, an upper cover 3, and a lock knob 1 for fixing a battery pack.
1 and a spring 12 and a battery pack 4 mounted on the back of the main unit. Here, a fin portion 1c is formed on the entire back surface of the chassis 1, and a plurality of air holes 3a are provided on the back surface of the upper case 3. Here, the amount of heat generated on the PA module 5 and the substrate 6 is radiated from the rear surface fin portion 1c of the chassis 1 to the outside air via the air holes 3a.

A heat dissipation structure which is a second embodiment of the present invention will be described with reference to FIG. FIG. 2A is a front view of the portable wireless device. FIG. 3B is a vertical sectional view. FIG. 7C is a bottom view when the heat dissipation adapter is not attached. FIG. 3D is a bottom view when the heat dissipation adapter is attached. FIG. 6E is a cross-sectional view. The configuration of the portable radio main body is the same as that of the first embodiment. The heat dissipation adapter here means
A heat radiation sheet 10 is attached to the front and back of the L-type heat radiation plate 8, and heat radiation fins 9 fixed to the lower side of the L-type heat radiation plate 8 with screws 13. A gap 18 is provided between the chassis 1 and the battery pack 4, and by mounting a heat dissipation adapter here, the amount of heat generated on the PA module 5 and the board 6 is released from the rear surface of the chassis 1 by the heat dissipation adapter. The heat is transferred to the heat radiating fins 9 via the sheet 10 and the heat radiating plate 8 and radiated to the outside air.

A heat dissipation structure which is a third embodiment of the present invention will be described with reference to FIG. FIG. 3A is a front view of the portable wireless device. FIG. 3B is a vertical sectional view. FIG. 7C is a bottom view when the heat dissipation adapter is attached. Figure (d)
FIG. The configuration of the portable radio main body is the same as that of the first embodiment. The heat dissipation adapter here means the heat dissipation fin 9 to which the heat dissipation sheet 10 is attached, and the heat dissipation fin 9
The lock knob 16 is fixed to the lower side with a screw 13 for fixing the battery pack 4 when attached. The heat dissipation adapter includes a chassis 1 of the main unit and a battery pack 4
It is to be mounted between the front and rear, and the front surface of the engaging portion 9a for engaging with the nail 1a of the chassis 1, the rear surface for engaging the nail portion 9b of the battery pack 4 with the nail 4b, and the upper surface of the lock knob 11 for attachment / detachment to / from the main unit. A claw portion 8a for stopping engagement with the claw 11a, a radiating fin 9 having a plurality of fin shapes formed on the body portion, and a lock knob 16 for fixing when the battery pack 4 is attached are provided on the bottom surface. The lock knob 16 is attached to the spacer 1 with the screw 13.
5, the spacer 17 and the spring 14 are screwed to the radiating fin 9, and the central slit 16a is used as a guide to slide in the front-rear direction to stop at a position where the convex portion 14a and the concave portion 16b meet. Here, the amount of heat generated on the PA module 5 and the substrate 6 is transferred from the rear surface of the chassis 1 to the heat radiation fins 9 via the heat radiation sheet 10 and is radiated to the outside air.

[0008]

According to the first embodiment of the present invention, the heat dissipation fins formed on the back surface of the chassis of the main body unit can significantly increase the heat dissipation surface area, and the temperature rise inside the main body can be reduced. It is possible to provide a small portable wireless device that can secure a long-time callable time and is effective for data communication. Further, since the high temperature portion is inside the battery pack, the user does not touch the high temperature portion directly, which is safe. According to the second and third embodiments of the present invention, it is possible to provide a small portable wireless device which can talk for a long time by mounting a heat dissipation adapter and can support data communication and a simple base station. Further, the heat dissipation adapter can be handled as an option attachable / detachable by the user, and the portable radio standard body can be provided at a low cost and in a compact size.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a first embodiment of the present invention.

FIG. 2 is a diagram showing an appearance of a second embodiment of the present invention.

FIG. 3 is a diagram showing an appearance of a third embodiment of the present invention.

FIG. 4 is a diagram showing the appearance of a conventional example.

[Explanation of symbols]

1: Chassis, 2: Front cover, 3: Top cover, 4:
Battery pack, 5: PA module, 6: Printed circuit board,
7: Screw, 8: Heat sink, 9: Heat sink fin, 10: Heat sink sheet, 11: Lock knob, 12: Spring, 13: Screw, 1
4: Spring, 15: Spacer, 16: Lock knob, 17:
Spacer, 18: gap, 1a: claw portion, 1b: boss, 1
c: fin part, 3a: air hole part, 4a: claw part, 4b: claw part, 8a: claw part, 9a: claw part, 9b: claw part, 11a: claw part, 14a: convex part, 16a: slit, 16b : Recess

Claims (2)

[Claims] 1. A portable wireless device having a metal chassis having a heating element mounted on the rear side of the inside of a main unit, wherein a battery pack is mounted on the chassis surface, a gap is provided between the main unit and the battery pack, and the back surface of the chassis is provided. A portable wireless device characterized in that a plurality of fin shapes are formed on the. 2. In a portable wireless device having a metal chassis having a heating element mounted on a rear side of an inside of a main unit and mounting a battery pack on the chassis surface, a removable heat dissipation adapter is mounted between the chassis and the battery pack. A portable wireless device characterized by being configured to.